What limitation should a consultant mention regarding reporting snapshots?

The correct answer highlights a key aspect of how reporting snapshots function within the system. Reporting snapshots are designed to take "snapshots" of data at specific intervals, and this means that they can only capture data from the point forward after they have been configured and enabled. They do not retroactively pull in data from before the snapshot was established, which can be a vital limitation to communicate to users who may assume that reporting snapshots would provide a complete historical view of data. This limitation ensures that affected stakeholders understand that to capture historical data, they must set up snapshots appropriately in advance.

In contrast, the other options describe characteristics of reporting snapshots but do not address critical limitations. For instance, while it is true that reporting snapshots can run on a monthly basis, have capabilities for displaying various chart types, and can hold data for a significant period like the past three years, these details do not involve restrictions or limitations inherent to how the reporting snapshots operate.